Meroterpenoids and isoberkedienolactone from endophytic fungus Penicillium sp. associated with Dysosma versipellis

Seven meroterpenoids and five small-molecular precursors were isolated from Penicillium sp.,an endophytic fungus from Dysosma versipellis.The structures of new compounds,11β-acetoxyisoaustinone(1)and isoberkedienolactone(2)were elucidated based on analysis of the spectral data,and the absoluteconfiguration of 2 was established by TDDFT ECD calculation with satisfactory match to its experimentalECD data.Meroterpenoids originated tetraketide and pentaketide precursors,resepectively,were found to be simultaneously produced in specific fungus of Penicillium species.These compounds showed weak cytotoxicity in vitro against HCT-116,HepG2,BGC-823,NCI-H1650,and A2780 cell lines with IC₅₀ > 10 µmol·L^-1.